10:20 p.m.
I believe I have found a performance issue in JBoss AS 5.1.0.GA caused by the use of a
ConcurrentHashMap with URL objects as the hash key. The offending usage is in
VFSClassLoaderPolicy, in a member field named manifestCache. The field manifestCache is
initialized as ConcurrentHashMap<URL, Manifest>();
The underlying issue is that URL.hashCode() is a non-trivial operation, often requiring a
DNS lookup. This DNS lookup can take a long time to timeout, adding up to 1-minute to the
startup time of the application server .The issue is also encountered during runtime if
certain class loader features are used (ie. getResource), causing up to a 1-minute delay
when such features are used.
The DNS lookups will never resolve in most cases, as the URL objects in question are
usually in the form of:
vfsmemory:aa15-xok7cr-fznfpulr-1-fznfpxto-7...
A simple fix is to use the String returned form URL.toString() as the map key.
Can anyone confirm that this in in fact a bug? The delays can be a significant issue,
especially the runtime delays.
Backtrace showing URL.hashCode causing a DNS lookup when used in ConcurrentHashMap from
VFSClassLoaderPolicy:
| Inet6AddressImpl.lookupAllHostAddr(String) line: not available [native method]
| InetAddress$1.lookupAllHostAddr(String) line: 849
| InetAddress.getAddressFromNameService(String, InetAddress) line: 1200
| InetAddress.getAllByName0(String, InetAddress, boolean) line: 1153
| InetAddress.getAllByName(String, InetAddress) line: 1083
| InetAddress.getAllByName(String) line: 1019
| InetAddress.getByName(String) line: 969
| Handler(URLStreamHandler).getHostAddress(URL) line: 420
| Handler(URLStreamHandler).hashCode(URL) line: 337
| URL.hashCode() line: 857 [local variables unavailable]
| ConcurrentHashMap<K,V>.get(Object) line: 768
| VFSClassLoaderPolicy.getClassPackageInformation(String, String) line: 606
| BaseClassLoader.definePackage(String, URL) line: 722
| BaseClassLoader$2.run() line: 567
| BaseClassLoader$2.run() line: 532
| AccessController.doPrivileged(PrivilegedAction<T>, AccessControlContext) line:
not available [native method]
| BaseClassLoader.loadClassLocally(String, boolean) line: 530
| BaseClassLoader.loadClassLocally(String) line: 507
| DelegateLoader(BaseDelegateLoader).loadClass(String) line: 134
| ClassLoadingTask$ThreadTask.run() line: 452
| ClassLoaderManager.nextTask(Thread, ClassLoadingTask) line: 251
| ClassLoaderManager.process(Thread, ClassLoadingTask) line: 150
| ClassLoaderDomain(BaseClassLoaderDomain).loadClass(BaseClassLoader, String, boolean)
line: 265
| ClassLoaderDomain(BaseClassLoaderDomain).loadClass(BaseClassLoader, String) line:
1119
| BaseClassLoader.loadClassFromDomain(String, boolean) line: 798
| BaseClassLoader.loadClass(String, boolean) line: 441
| BaseClassLoader(ClassLoader).loadClass(String) line: 252
| ToClassInvoker.toClass(ToClassInvokerPoolReference, CtClass, String, ClassLoader,
ProtectionDomain) line: 88
| JBossClDelegatingClassPool.toClass(CtClass, ClassLoader, ProtectionDomain) line: 81
| CtNewClass(CtClass).toClass(ClassLoader, ProtectionDomain) line: 1094
| TransformerCommon$ToClassAction$2.toClass(CtClass, ClassLoader, ProtectionDomain)
line: 331
| TransformerCommon.toClass(CtClass, ClassLoader, ProtectionDomain) line: 139
| ProxyFactory.createProxyClass(ClassLoader, ProxyMixin[], Class<?>[]) line:
126
| ProxyFactory.createInterfaceProxy(GUID, ClassLoader, Class<?>[], ProxyMixin[],
InstanceAdvisor) line: 96
| ProxyFactory.createInterfaceProxy(GUID, ClassLoader, Class<?>[]) line: 86
| Remoting.createRemoteProxy(Object, ClassLoader, Class[], InvokerLocator,
List<Interceptor>, String) line: 102
| ManagedOperationProxyFactory.createDispatcherProxy() line: 203
| ManagedOperationProxyFactory.start() line: 109
| NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available
[native method]
| NativeMethodAccessorImpl.invoke(Object, Object[]) line: 39
| DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 25
| Method.invoke(Object, Object...) line: 597
| ReflectionUtils.invoke(Method, Object, Object[]) line: 59
| ReflectMethodInfoImpl.invoke(Object, Object[]) line: 150
| BasicMethodJoinPoint.dispatch() line: 66
| KernelControllerContextAction$JoinpointDispatchWrapper.execute() line: 241
|
KernelControllerContextAction$JoinpointDispatchWrapper(ExecutionWrapper).execute(AccessControlContext)
line: 47
| KernelControllerContextAction.dispatchExecutionWrapper(KernelControllerContext,
ExecutionWrapper) line: 109
| KernelControllerContextAction.dispatchJoinPoint(KernelControllerContext, Joinpoint)
line: 70
|
StartStopLifecycleAction(LifecycleAction).installActionInternal(KernelControllerContext)
line: 221
| StartStopLifecycleAction(InstallsAwareAction).installAction(KernelControllerContext)
line: 54
| StartStopLifecycleAction(InstallsAwareAction).installAction(ControllerContext) line:
42
|
StartStopLifecycleAction(SimpleControllerContextAction<T>).simpleInstallAction(T)
line: 62
|
StartStopLifecycleAction(AccessControllerContextAction<S,T>).install(ControllerContext)
line: 71
|
KernelControllerContextActions(AbstractControllerContextActions).install(ControllerContext,
ControllerState, ControllerState) line: 51
| AbstractKernelControllerContext(AbstractControllerContext).install(ControllerState,
ControllerState) line: 348
| AbstractKernelController(AbstractController).install(ControllerContext,
ControllerState, ControllerState) line: 1631
| AbstractKernelController(AbstractController).incrementState(ControllerContext,
boolean) line: 934
| AbstractKernelController(AbstractController).resolveContexts(ControllerState,
ControllerState, boolean) line: 1082
| AbstractKernelController(AbstractController).resolveContexts(boolean) line: 984
| AbstractKernelController(AbstractController).install(ControllerContext, boolean)
line: 774
| AbstractKernelController(AbstractController).install(ControllerContext) line: 540
| ServiceController.doInstall(KernelController, ServiceControllerContext) line: 670
| ServiceController.register(ObjectName, Collection<ObjectName>, boolean, Object)
line: 373
| ServiceControllerRegistrationLifecycleCallback.install(ControllerContext) line: 104
| NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available
[native method]
| NativeMethodAccessorImpl.invoke(Object, Object[]) line: 39
| DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 25
| Method.invoke(Object, Object...) line: 597
| ReflectionUtils.invoke(Method, Object, Object[]) line: 59
| ReflectMethodInfoImpl.invoke(Object, Object[]) line: 150
| BasicMethodJoinPoint.dispatch() line: 66
| AbstractBeanInfo.invoke(Object, String, String[], Object[]) line: 300
| AbstractKernelControllerContext.invoke(String, Object[], String[]) line: 286
| AbstractLifecycleCallbackItem.install(ControllerContext) line: 87
|
AbstractKernelController(AbstractController).handleLifecycleCallbacks(ControllerContext,
ControllerState, boolean) line: 1568
|
AbstractKernelController(AbstractController).handleInstallLifecycleCallbacks(ControllerContext,
ControllerState) line: 1533
| AbstractKernelController(AbstractController).incrementState(ControllerContext,
boolean) line: 943
| AbstractKernelController(AbstractController).resolveContexts(ControllerState,
ControllerState, boolean) line: 1082
| AbstractKernelController(AbstractController).resolveContexts(boolean) line: 984
| AbstractKernelController(AbstractController).change(ControllerContext,
ControllerState, boolean) line: 822
| AbstractKernelController(AbstractController).change(ControllerContext,
ControllerState) line: 553
| ServiceController.doChange(KernelController, ServiceControllerContext,
ControllerState, String) line: 688
| ServiceController.start(ObjectName) line: 460
| ServiceControllerStartStopLifecycleCallback.install(ControllerContext) line: 44
| NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available
[native method]
| NativeMethodAccessorImpl.invoke(Object, Object[]) line: 39
| DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 25
| Method.invoke(Object, Object...) line: 597
| ReflectionUtils.invoke(Method, Object, Object[]) line: 59
| ReflectMethodInfoImpl.invoke(Object, Object[]) line: 150
| BasicMethodJoinPoint.dispatch() line: 66
| AbstractBeanInfo.invoke(Object, String, String[], Object[]) line: 300
| AbstractKernelControllerContext.invoke(String, Object[], String[]) line: 286
| AbstractLifecycleCallbackItem.install(ControllerContext) line: 87
|
AbstractKernelController(AbstractController).handleLifecycleCallbacks(ControllerContext,
ControllerState, boolean) line: 1568
|
AbstractKernelController(AbstractController).handleInstallLifecycleCallbacks(ControllerContext,
ControllerState) line: 1533
| AbstractKernelController(AbstractController).incrementState(ControllerContext,
boolean) line: 943
| AbstractKernelController(AbstractController).resolveContexts(ControllerState,
ControllerState, boolean) line: 1082
| AbstractKernelController(AbstractController).resolveContexts(boolean) line: 984
| AbstractKernelController(AbstractController).install(ControllerContext, boolean)
line: 774
| AbstractKernelController(AbstractController).install(ControllerContext) line: 540
| BeanMetaDataDeployer.deploy(DeploymentUnit, BeanMetaData) line: 121
| BeanMetaDataDeployer.deploy(DeploymentUnit, Object) line: 51
|
BeanMetaDataDeployer(AbstractSimpleRealDeployer<T>).internalDeploy(DeploymentUnit)
line: 62
| BeanMetaDataDeployer(AbstractRealDeployer).deploy(DeploymentUnit) line: 50
| DeployerWrapper.deploy(DeploymentUnit) line: 171
| DeployersImpl.doDeploy(Deployer, DeploymentUnit) line: 1439
| DeployersImpl.doInstallParentFirst(Deployer, DeploymentContext) line: 1157
| DeployersImpl.doInstallParentFirst(Deployer, DeploymentContext) line: 1178
| DeployersImpl.install(ControllerContext, ControllerState, ControllerState) line:
1098
| DeploymentControllerContext(AbstractControllerContext).install(ControllerState,
ControllerState) line: 348
| AbstractKernelController(AbstractController).install(ControllerContext,
ControllerState, ControllerState) line: 1631
| AbstractKernelController(AbstractController).incrementState(ControllerContext,
boolean) line: 934
| AbstractKernelController(AbstractController).resolveContexts(ControllerState,
ControllerState, boolean) line: 1082
| AbstractKernelController(AbstractController).resolveContexts(boolean) line: 984
| AbstractKernelController(AbstractController).change(ControllerContext,
ControllerState, boolean) line: 822
| AbstractKernelController(AbstractController).change(ControllerContext,
ControllerState) line: 553
| DeployersImpl.process(List<DeploymentContext>, List<DeploymentContext>)
line: 781
| MainDeployerImpl.process() line: 702
| MainDeployerAdapter.process() line: 117
| ProfileDeployAction.install(Profile) line: 70
| ProfileDeployAction(AbstractProfileAction).install(ProfileContext) line: 53
| AbstractProfileService.install(ControllerContext, ControllerState, ControllerState)
line: 361
| ProfileContext(AbstractControllerContext).install(ControllerState, ControllerState)
line: 348
| ScopedProfileServiceController(AbstractController).install(ControllerContext,
ControllerState, ControllerState) line: 1631
| ScopedProfileServiceController(AbstractController).incrementState(ControllerContext,
boolean) line: 934
| ScopedProfileServiceController(AbstractController).resolveContexts(ControllerState,
ControllerState, boolean) line: 1082
| ScopedProfileServiceController(AbstractController).resolveContexts(boolean) line:
984
| ScopedProfileServiceController(AbstractController).change(ControllerContext,
ControllerState, boolean) line: 822
| ScopedProfileServiceController(AbstractController).change(ControllerContext,
ControllerState) line: 553
| AbstractProfileService.activateProfile(ProfileKey) line: 306
| ProfileServiceBootstrap.start(Server) line: 271
| ServerImpl(AbstractServerImpl).start() line: 461
| Main.boot(String[]) line: 221
| Main$1.run() line: 556
| Thread.run() line: 619
|
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